Three speeds circulating twin pumps with threaded ports CANNOT BE SOLD IN THE EU Construction Pump casing with suction and delivery connections with the same diameter and on the same axis (in-line). Brass or cast iron unions on request. Materials Pump casing Impeller Shaft NCD3 ..40 Cast iron Composite Stainless steel NCD3 ...70-80-120 Cast iron Composite Ceramic For clean liquids, without abrasives, which are non-aggressive for the pump materials. Civil and industrial heaty sistems. Single operation Operation of a single pump choosed by the customer, with the second pump on stand-by Double operation Operation in parallel of the two pumps Operating conditions Liquid temperature from +5 °C to +110 °C (from -10 °C to +110 °C for NCD3 ..-70 and NCD3 ..-80-120). Ambient temperature up to 40 °C. Sound pressure ≤ 43 dB (A). Maximum glycol quantity: 50% (Mixture with more than 20% glycol content require recheking of the pumping data). Maximum permissible working pressure 10 bar. Minimum suction pressure: bar Temperature 50 °C 80 °C 110 °C 2-pole induction motor, 50 Hz. Three adjustable speeds. NCD3: single-phase 230 V. Insulation class H. Protection IP 44. Designation Series DN ports in mm Max. head in dm connection size mm

Three speeds circulating twin pumps with threaded ports Characteristic curves, dimensions and weights 4,5 Single operation Operation in parallel 4 Single operation Operation in parallel

KI ^\ O Three speeds circulating twin pumps IN \J O with threaded ports Single operation Single operation — — — — — — Operation in parallel — — — — — — Operation in parallel